Summary of the Bancorp's Long-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Long-term debt	$ 9,682	[1]	$ 9,558	[1]
Parent company
Debt Instrument [Line Items]
Long-term debt	6,784		5,960
Parent company | Senior Debt Obligations | Fixed Rate 6.25 Percent Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Interest rate	6.25%
Long-term debt	779		797
Parent company | Senior Debt Obligations | Fixed Rate 3.625 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity	2016
Interest rate	3.625%
Long-term debt	1,000
Parent company | Subordinated Debt [Member] | Floating Rate 0.98 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity	2016
Variable interest rate	0.98%
Long-term debt	250		250
Parent company | Subordinated Debt [Member] | Fixed Rate 5.45 Percent Notes Due 2017
Debt Instrument [Line Items]
Maturity	2017
Interest rate	5.45%
Long-term debt	589		613
Parent company | Subordinated Debt [Member] | Fixed Rate 4.50 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity	2018
Interest rate	4.50%
Long-term debt	581		584
Parent company | Subordinated Debt [Member] | Fixed Rate 8.25 Percent Notes Due 2038
Debt Instrument [Line Items]
Maturity	2038
Interest rate	8.25%
Long-term debt	1,348		1,034
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 6.50 Percent Notes Due 2067
Debt Instrument [Line Items]
Maturity	2067
Interest rate	6.50%
Long-term debt	750		750
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 7.25 Percent Notes Due 2067 | Group 1 [Member]
Debt Instrument [Line Items]
Maturity	2067
Interest rate	7.25%
Long-term debt	594		613
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 7.25 Percent Notes Due 2067 | Group 2 [Member]
Debt Instrument [Line Items]
Interest rate	7.25%
Long-term debt	894		907
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 8.88 Percent Notes Due 2068
Debt Instrument [Line Items]
Long-term debt			400
Parent company | Structured Repurchase Agreements [Member]
Debt Instrument [Line Items]
Long-term debt	375
Parent company | Structured Repurchase Agreements [Member] | Floating Rate 2.49 Percent Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Variable interest rate	2.49%
Long-term debt	250
Parent company | Structured Repurchase Agreements [Member] | Floating Rate 2.54 Percent Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Variable interest rate	2.54%
Long-term debt	125
Subsidiaries [Member] | Senior Debt Obligations | Floating Rate 0.58 Percent Bank Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Variable interest rate	0.58%
Long-term debt	500		499
Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate 4.75 Percent Bank Notes Due 2015
Debt Instrument [Line Items]
Maturity	2015
Interest rate	4.75%
Long-term debt	561		561
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Fixed Rate 7.25 Percent Notes Due 2067 | Group 2 [Member]
Debt Instrument [Line Items]
Maturity	2067
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate 3.4 To 4.15 Percent Bank Notes Due 2032 And 2033 Member
Debt Instrument [Line Items]
Long-term debt			51
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate 5.29 Percent Debentures Due 2034 Member
Debt Instrument [Line Items]
Long-term debt			67
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate 1.97 - 2.24 Percent Debentures Due 2035
Debt Instrument [Line Items]
Maturity	2035
Long-term debt	62		62
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate 1.97 - 2.24 Percent Debentures Due 2035 | Lower Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	1.97%
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate 1.97 - 2.24 Percent Debentures Due 2035 | Upper Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	2.24%
Subsidiaries [Member] | Federal Home Loan Bank Advances [Member] | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2012 And 2041
Debt Instrument [Line Items]
Maturity, end	2041
Long-term debt	1,055		1,561
Subsidiaries [Member] | Federal Home Loan Bank Advances [Member] | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2012 And 2041 | Lower Limit [Member]
Debt Instrument [Line Items]
Maturity, start	2012
Variable interest rate	0.05%
Subsidiaries [Member] | Federal Home Loan Bank Advances [Member] | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2012 And 2041 | Upper Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	8.34%
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Fixed Rate 4.81 Percent Bank Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Interest rate	4.81%
Long-term debt	2		99
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.81 To 2.25 Percent Debentures Due 2013 And 2015
Debt Instrument [Line Items]
Maturity, start	2013
Maturity, end	2015
Long-term debt	169		460
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.81 To 2.25 Percent Debentures Due 2013 And 2015 | Lower Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	0.81%
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.81 To 2.25 Percent Debentures Due 2013 And 2015 | Upper Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	2.25%
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.50 Percent Bank Notes Due 2023
Debt Instrument [Line Items]
Maturity	2023
Variable interest rate	0.50%
Long-term debt	22		133
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Debt Other Variable Percent Due 2012 Through 2039
Debt Instrument [Line Items]
Maturity, start	2012
Maturity, end	2039
Long-term debt	$ 151		$ 117

[1] At December 31, 2011 and 2010, includes $30 and $52 of cash, $7 of other short-term investments, $50 and $29 of commercial mortgage loans, $223 and $241 of home equity loans, $259 and $648 of automobile loans, ($10) and ($14) of ALLL, $4 and $7 of other assets, $4 and $12 of other liabilities, $191 and $692 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 11.